Provide framework for exiting with non-zero value on non-critical errors.

usr.bin/tar/bsdtar.c

@@ -409,7 +409,7 @@ main(int argc, char **argv)
 		free(bsdtar->user_uname);
 
 	cleanup_exclusions(bsdtar);
-	return 0;
+	return (bsdtar->return_value);
 }
 
 /*

usr.bin/tar/bsdtar.h

@@ -72,6 +72,8 @@ struct bsdtar {
 	size_t		  u_width; /* for 'list_item' in read.c */
 	char		 *user_uname; /* User running this program */
 	uid_t		  user_uid; /* UID running this program */
+	int		  return_value; /* Value returned by main() */
+	char		  warned_lead_slash; /* Already displayed warning */
 
         /*
 	 * Data for various subsystems.  Full definitions are located in